Ensure currentItem is released when the delegate changes

Otherwise a new delegate isn't created for the currentItem.
GridView didn't release any item.  It is now equivalent to LsitView.

Task-number: QTBUG-12548
Reviewed-by: Bea Lam
(cherry picked from commit a07bae9717168c9605662e117132e16b5f2b2f9d)

2 files changed, 7 insertions, 0 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativegridview.cpp b/src/declarative/graphicsitems/qdeclarativegridview.cpp
index f02ef6b..68a4c64 100644
--- a/src/declarative/graphicsitems/qdeclarativegridview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativegridview.cpp
@@ -1278,6 +1278,11 @@ void QDeclarativeGridView::setDelegate(QDeclarativeComponent *delegate)
     if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) {
         dataModel->setDelegate(delegate);
         if (isComponentComplete()) {
+            for (int i = 0; i < d->visibleItems.count(); ++i)
+                d->releaseItem(d->visibleItems.at(i));
+            d->visibleItems.clear();
+            d->releaseItem(d->currentItem);
+            d->currentItem = 0;
             refill();
             d->moveReason = QDeclarativeGridViewPrivate::SetIndex;
             d->updateCurrent(d->currentIndex);
diff --git a/src/declarative/graphicsitems/qdeclarativelistview.cpp b/src/declarative/graphicsitems/qdeclarativelistview.cpp
index 256948a..82b3e1c 100644
--- a/src/declarative/graphicsitems/qdeclarativelistview.cpp
+++ b/src/declarative/graphicsitems/qdeclarativelistview.cpp
@@ -1620,6 +1620,8 @@ void QDeclarativeListView::setDelegate(QDeclarativeComponent *delegate)
             for (int i = 0; i < d->visibleItems.count(); ++i)
                 d->releaseItem(d->visibleItems.at(i));
             d->visibleItems.clear();
+            d->releaseItem(d->currentItem);
+            d->currentItem = 0;
             refill();
             d->moveReason = QDeclarativeListViewPrivate::SetIndex;
             d->updateCurrent(d->currentIndex);